The extracted facial features are then fed to deep fully connected layers that regress AU intensities and robustly perform AU classification. The proposed algorithm is applied to the SRD’15 stress dataset, which contains neutral and stress states related to four types of stressors
Apart from the AU classi- fication itself, the proposed AU classification network offers also a reliable confidence score about the presence of each AU in every input imag
We use AUs for stress analysis and recognition because the AUs present different patterns between neutral and stress states. In most cases, the AU’s intensity is signifi- cantly higher during stress conditions as compared to a neu- tral state indicating a more expressive face
Fig. 3 visualizes typical timeseries of an AU (AU17) for a neutral and a stressful task (adventure video)
AU06, AU26, AU12, AU07, AU25, AU09, AU01, AU04, AU15, AU10, AU17, AU23, AU05, AU14
AU06, AU26, AU17, AU25, AU10, AU23, AU12, AU15, AU07, AU05, AU14, AU01
AU06, AU12, AU25, AU26, AU14, AU07, AU17, AU23, AU15, AU04, AU05, AU10
An interesting conclusion is that stressful tasks lead to significant increased AU intensities, i.e. a more ”expressive” face.
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